Since it will be coming for everyone, the solution will be major social upheaval with some consequence for all of humanity, hopefully a good one where we somehow manage to keep on living some kind of good life.

Regarding being jobless for the 3 intervening years, it is certainly a personal concern but in this temporary phase there are still some other jobs for smart people. Once there aren't any, we are entering the part that I was talking about where you will be far from alone and you can join together to exert some kind of political pressure but it will not be about math PhDs, but employment as a whole. And it may not be very effective if AI is on the other side, not on yours. Yeah, it sounds like scifi, and people want to dismiss scifi concerns and instead focus just one inch ahead of their toes, instead of seeing the writing on the wall.